Structure formation and mechanical properties of thermoplastic elastomer and oil system having a microcellular porous structure

Autor: Yoshihide Fukahori, Naruhiko Mashita
Rok vydání: 2004
Předmět:
Zdroj: Journal of Applied Polymer Science. 95:107-112
ISSN: 1097-4628
0021-8995
DOI: 10.1002/app.20797
Popis: A novel microcellular porous structure, the product of a small proportion of a semicrystalline thermoplastic elastomer and a large proportion of low molecular weight oil, was examined. The system exhibited a unique three-dimensional continuous polymer network, consisting of interconnected spherical cells of a few tens of micrometers in diameter. In this report, details of morphology and stress-strain relationship of the system, which is made from hydrogenated poly[butadiene-b-(styrene-random-butadiene)] (H-SBR) as a semicrystalline thermoplastic elastomer and straight asphalt as an oil, were investigated and analyzed. The system exhibited inverse S-shape type stress-strain curves, but was characterized by extension rate and polymer concentration dependency. It was demonstrated that the stress-strain curves of the system can be described by a simple combination of that of two phases: asphalt-rich phase and H-SBR-rich phase. Calculations of a simple parallel model quantitatively agreed with experimental data, especially in the case of higher polymer concentrations (about 12 to 20 vol %) where uniform polymer network is formed over the whole system. Disagreement between calculation and experimental data was, however, found in the cases of very small proportions of H-SBR (< ∼ 8 vol %), where the polymer network structure in the system was imperfect.
Databáze: OpenAIRE
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